Visible indicator for concealed typewriter margin stops



April 3, 1954 E. H. SARGATZ 2,675,111

VISIBLE INDICATOR FOR CONCEALED 'I'YPEWRITER MARGIN STOPS Filed Jan. 12,1952 "Km-i "inI(aItIIlll/I/IiiIZIIIIIIIII/ilillllllllllliiilliifiill"app.

IN VEN TOR.

EARL H. SARGATZ "gamut spa.

ATTORNEY.

Patented Apr. 13, 1954 VISIBLE INDICATOR FOR CONCEALED TYPEWRITER MARGIN STOPS Earl H. Sargatz, Stamford, 001111., assignor to Remington Band1110., New York, N. Y., acorporation of Delaware Application January 12,1952, Serial No. 266,143

This invention relates to an improved indicator for visibly determiningthe set positions of concealed margin stops of the kind. used upontypewriters or like business machines to arrest or limit the papercarriage movements in letterspacing or return directions.

The recent trend in the manufacture of modern typewriters, and otherbusiness machines, has been toward key-set margin stops rather thanstops set by direct manipulation. This has eliminated the necessity ofdirect access to the stops by the operaton'and as a result, margin stopson -modern machines are now no longer accessible and are completelyconcealed from the operators view which results in certaindisadvantages. For example, when an operator desires to know the exactpositions to which the concealed margin stops are set, it is necessaryto shift the paper carriage until its movement is arrestedby engagementof the stops with the conventional center post, and then only by acomparison-of the carriage scale relative to the printing zone. Suchprocedure is not only inconvenient but consumes an unwarranted amount ofthe operators time.

The present invention therefore contemplates the provision of newandnovel means for visibly determining the locations or set positions ofconcealed margin stops.

More specifically, the invention contemplates the provision of marginstop indicating elements that are visible through a slot in the carriagepaper table and moved through magnetic attraction in accordance withmovements imparted to the margin stops; and mechanism of the characterreferred to which is of simple construction,

automatic in its operation, readily installed upon existingbusinessmachines and certain in its action in correctly indicating the setpositions or locations of concealed margin stops.

Other objects and advantages of the invention will be'pointed out inrthefollowing description and claims, and illustrated in the accompanyingdrawing, which discloses, by way of example only,

the principle of the invention and the best mode,

which has been contemplated, of applying that principle,

in the drawing:

Fig. 1 is a fragmentary front perspective view of a typewriter embodyingthe present invention.

Fig. 2 is a detail view of the margin stop indicator elements and theirsupporting tube which is shown in longitudinal section.

Fig. 3 is a transverse vertical sectional view of the typewritercarriage taken along the line 3--3 iii! typewriter paper carriage.

table H, as clearly illustrated in Fig. .3.

indicator elements, such as balls 23 formed of plugs 23. from contactingone another by a sliding sepaof Fig. 1 and showing only the partsimmediately concerned with the present invention, and,

Fig. 4 is a fragmentary rear elevational view partly in section alongthe line 4-4 of Fig. 3 to illustrate the indicator magnet and itssupporting arm for the left-hand selectively settablle margin stop.

The invention, as illustrated, is embodied in 2. Remington typewriterand the drawing shows only such conventional parts of the typewriter asare deemed necessary to make clear the manner of applying the marginstop indicators to typewriters generally.

Referring now to Fig. 1 of the drawing, reference numeral 10 indicates atypewriter and I I the The paper carriage includes end plates I2 rigidlysupported inspaced relation relative to one another by rail l3 and crossbar Hi. The bar 14 is attached. to end plates H by screws Ida and therail 13 is attached to said plates by screws l3a. A paper trough l5,

suitably supported by the carriage extends under and upwardly to therear of platen It as clearly illustrated in the sectional View Fig. 3..All parts thus far described may be of any well known or 1 conventionalconstrution, as they form no part of the instant invention.

Right and left-handmargin stops l8 (Figs. 3

J and 4) are slidably mounted upon the conventional toothed supportingrack l9 and are selec- 1 tively positioned along said rack in the usualmanner by a keyboard control key not shown. A

one-piece paper table, l1, fastened to the end i plates I2, completelyconceals the margin stops l 8 as will be apparent from a study of Figs.1 and 3. The visible indicator for the concealed margin stops will nowbe described in detail.

Transparent tube 21!, attached to the underside of paper table 11 bysuitablemeans such as straps 2 I, projects througha longitudinal slot 22in paper Two magnetic material and preferably colored for contrastagainst the paper table, are confined for longitudinal movement withintube 20 by end The indicator elements are prevented rator or insulator28 formed. of non-magnetic material for reasons presently disclosed.

Right and left-hand margin stops iii are each provided with an upwardlyand forwardly projecting arm 25, and each arm supports a magnet 25 inclose proximity to tube 20. Therefore, the construction is such that anymovement imparted to the stops it, when changing their positions uponthe toothed rack l9, causes the balls or indicators 23, confined withintube 20, to accurately follow the stops entirely through magneticattraction of magnets 25. Thus, the positions of the concealed stopsupon the toothed rack beneath the paper table can be visibly determinedby merely observing the locations of the colored-indicator elements 23relative to the scale 21. As shown in Fig. 1 this 7 scale may bedirectly imprinted upon the paper The circumference of cylindricalseparatorlaiisalso made slightly smaller than the inside, diameter oftube 20 so that it too is permitted to slide freely Within said tube.-The purpose of separator 28 is to preclude any possibility of balls 23becoming magnetically attracted to the same magnet, or to each other,when margin stops [8 are shifted or moved into closeproximity tc-oneanother. I

From the above detailed description, taken in connection with thedrawing, it is believed that operation of th visible indicator forconcealed V typewriter margin stops will now be apparent.

For example, by referencetc Fig. 1 it will be observed that left-handmargin stop l8 has been set at'25' and that right-hand margin stopI8'has been set at 9 2. This can be visibly determined by merelyglancing at the positions or locations 01 .the indicator elements orballs 23 relative to the scale 21 even though th margin stops 18 areconcealed from view by the paper table 11. It will be further noted thatthe only connection between therballs 23 and the concealed margin stops[8 is through the magnetic attraction existing between the balls andmagnets 25, and since the balls are free totravel longitudinally withintube ZB they-Will accurately follow any and all movement thatis-imparted te -their respective margin stops along toothed rack 19.

Although but one particular embodiment of the invention has been shownand described, it will be apparent tothose skilled in the typewriter artthat numerous variations and modifications may-be made in the particularconstruction with out departing from the underlying principles-of the"invention. It is therefor desired, by the following claims, to includewithin the scope of the invention, all such variations and modificationswhereby substantially the results of the invention may be obtained bythe use of substantially the same or equivalent means.

The invention claimed is: V

1. In a typewriter or like machine wherein the paper carriage movementsar limited in letterspacing and return directions by key-set marginstops that are concealed from view, apparatus for visibly indicating thelocation of such concealed stops comprising, magnetic means mounted formovement with each of said stops; a paper table having a slot-likeaperture extending longitudinally thereof; a-scale located adjacent saidaperture; and indicating elements visible through said slot and movablelongitudinally of said paper tahis in response tomagnetic attraction oftheir as- ,sociated magnetic means when said stops are moved.

2. In a typewriter or like machine wherein the paper carriage movementsare limited in letterspacing and return directions by adjustable marginstops that are concealed from view and inaccessible for direct manualmanipulation, apparatus for visibly indicating the set positions of saidstops comprising, magnetic means carried by and movable with each ofsaid stops; a paper table mounted on the carriage and provided with aslotlike aperture extending longitudinally. thereof; scale graduationson said table adjacent said aperture; and indicating elementsco-operable with said scale, visible through said aperture, and. adaptedto move in unison with their respective stops through magneticattraction of said magnetic means.

3. In a structure for visibly indicating the set positions. of concealedmargin stops used on typewriters or like machines, the combinationcomprising a carriage; a paper table supported by the carriage andhaving a slot-like aperture extending'longitudinally thereof; a toothedsupporting rack mounted within said carriag and beneath said 7 table; aselectively settable margin stop mounted for sliding movement along saidrack; magnetic means carried by andmovable with-said stop; scalgraduations on said table adjacent said aperture; and an indicatorelement visible through said aperture and adapted to follow the movementof said stop through magnetic attraction. of said magnetic means.

4. In a typewriter. or like machine in which the movements of the papercarriag are limited by key-set margin stops that are concealed fromanoperators view, apparatus for visibly indicating the locations of saidstop's'comprising, in-combination, a permanent magnet carriedby andmovable with each stop; a paper table having a slot-like apertureextending longitudinallythereof; scale graduations on said tableadjacent said aperture; a transparent tube mounted beneath said-tableand partially projecting through said aperture; magnetic, indicatorelements freely movable within said tube and visible through saidaperture; and a nonmagnetic separator slidable within said tube anddisposed between said indicator elements characterizedby the fact thatsaid indicator elements are caused to move in unison withtheirrespective stops through magnetic at traction of their respectivemagnets.

'5. In a typewriter or likebusiness machine'of the type having right andleft-hand margin stops concealed from View beneath the paper table,apparatus for visibly indicating theexact positions of said concealedstops comprising, a transparent tube attached to saidpaper table andvisible from the front of saidmachine; a pair'o-f indicating elementsformed of magneti'cmater-ia1 and freely movable" within said tube; aseparator of nonmagnetic material mounted for sliding movement withinsaid'tube and disposed between said-indicating elements to prevent themfrom contacting one another;means to retain said indicating elements andseparator within said tube; a magnet carried by and movable with saidright-hand margin stop to effectively move its associated indicatingelement throughmagnetic attraction; and a second magnetcarried by andmovable with said left-hand margin stop to effectively move itsassociated indicating element through magnetic attraction.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 2,2331572 Atkins Mar. 4, 1941 2,580,211, ,Aeb'i Dec. 25, 1-951

